I'm with FT in that BJ's almost never make me bust (only two girls have proven me different gifted with major DSL's).
As far as what to do, I (and Alek wrote about this too) prefer to get dome --> eat her pussy --> fuck. This way your cock has some time to rest after exploring her first orfice, she's nice and ready for re-entry, and then you both enjoy the sex lubed up and not ending prematurely.
One way I love to do this (and they do too) is have them blow you with you standing up, them on both knees until you've had enough, lift them up while kissing them/their neck, lay them down in bed (or whatever usable surface) and start with the tongue action. Works for missionary and doggy style with how you arrange them so you can just put your dick when they're ready.
Congrats on the head.
Hue